ws2_32: Implement SO_EXCLUSIVEADDRUSE for setsockopt.

dlls/ws2_32/socket.c

@@ -2729,6 +2729,15 @@ int WINAPI WS_setsockopt(SOCKET s, int level, int optname,
         return 0;
     }
 
+    /* SO_EXCLUSIVEADDRUSE stops applications from binding to a port that is
+     * already used. This never works on Unix systems, so just ignore this
+     * setting*/
+    if ( level == WS_SOL_SOCKET && optname == WS_SO_EXCLUSIVEADDRUSE )
+    {
+        TRACE("Ignoring SO_EXCLUSIVEADDRUSE\n");
+        return 0;
+    }
+
 #ifdef HAVE_IPX
     if(level == NSPROTO_IPX)
     {

include/winsock.h

@@ -663,6 +663,7 @@ typedef struct WS(WSAData)
 #define SO_DEBUG                   0x0001
 #define SO_ACCEPTCONN              0x0002
 #define SO_REUSEADDR               0x0004
+#define SO_EXCLUSIVEADDRUSE        ((u_int)(~SO_REUSEADDR))
 #define SO_KEEPALIVE               0x0008
 #define SO_DONTROUTE               0x0010
 #define SO_BROADCAST               0x0020
@@ -696,6 +697,7 @@ typedef struct WS(WSAData)
 #define WS_SO_DEBUG                0x0001
 #define WS_SO_ACCEPTCONN           0x0002
 #define WS_SO_REUSEADDR            0x0004
+#define WS_SO_EXCLUSIVEADDRUSE     ((WS_u_int)(~WS_SO_REUSEADDR))
 #define WS_SO_KEEPALIVE            0x0008
 #define WS_SO_DONTROUTE            0x0010
 #define WS_SO_BROADCAST            0x0020